The Baffin appears to be using something other than Primaloft according to Marmot's site; Thermal R Eco. This is the only description of the material I could find:
Thermal R is Marmot's proprietary family of polyester insulations specifically engineered to meet various needs from sleeping bags, to garments to gloves. Mid loft, excellent warmth to weight, resilient loft, and durable.
I find my Nano pullover good down to freezing while stationary although I need gloves, hat and Capilene lightweight top.